JPH08227038A - Zoom lens system - Google Patents
Zoom lens systemInfo
- Publication number
- JPH08227038A JPH08227038A JP7200703A JP20070395A JPH08227038A JP H08227038 A JPH08227038 A JP H08227038A JP 7200703 A JP7200703 A JP 7200703A JP 20070395 A JP20070395 A JP 20070395A JP H08227038 A JPH08227038 A JP H08227038A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- sub
- negative
- positive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive
Abstract
Description
【０００１】[0001]
【技術分野】本発明は、バックフォーカスが一眼レフカ
メラより小さいコンパクトカメラ用に適した２群タイプ
のズームレンズの小型化と高性能化に関する。TECHNICAL FIELD The present invention relates to miniaturization and high performance of a two-group type zoom lens suitable for a compact camera having a back focus smaller than that of a single-lens reflex camera.
【０００２】[0002]
【従来技術及びその問題点】従来、コンパクトカメラ用
のズームレンズは、物体側から、正、負の２つのレンズ
群からなる２群タイプと、正、正、負、あるいは、負、
正、負の３群のレンズ群からなる３群タイプ以上の多群
タイプがあるが、２群タイプは変倍比を大きくすると収
差（特に色収差）の補正が困難となり、多群タイプは構
造が複雑になる。2. Description of the Related Art Conventionally, zoom lenses for compact cameras have a two-group type consisting of two lens groups, positive and negative, from the object side, and positive, positive, negative, or negative,
There are three or more multi-group types consisting of positive and negative three lens groups, but the two-group type becomes difficult to correct aberrations (especially chromatic aberration) when the zoom ratio is increased, and the multi-group type has a structure. It gets complicated.
【０００３】[0003]
【発明の目的】本発明は、前者の２群タイプでありなが
ら、変倍比を約２．５倍以上と大きくし、かつ性能の良
好な小型のズームレンズ系を得ることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to obtain a compact zoom lens system which is a former two-group type, has a large zoom ratio of about 2.5 times or more and has good performance.
【０００４】[0004]
【発明の概要】本発明のズームレンズ系は、物体側から
順に、正の焦点距離を有する第１レンズ群と、負の焦点
距離を有する第２レンズ群からなり、第１、第２レンズ
群間隔を変化させて変倍を行うズームレンズにおいて、
第１レンズ群は、物体側から順に、第１ａサブ群と、第
１ｂサブ群からなり、この第１ａサブ群、第１ｂサブ群
はともに少なくとも１枚の負レンズを有し、さらに次の
条件式（１）ないし（５）を満足することを特徴として
いる。絞は第１レンズ群と第２レンズ群の間にあって、
第１レンズ群と一体に移動する。 （１）３．５＜ｆL ／ｆ1 ＜５．０ （２）１．７７＜Ｎ1aN （３）３５＜ν1aN ＜５０ （４）１．７７＜Ｎ1bN （５）３５＜ν1bN ＜５０ 但し、 ｆL ：長焦点側の全系の焦点距離、 ｆ1 ：第１レンズ群の焦点距離、 Ｎ1aN ：第１ａサブ群中の負レンズのｄ線の屈折率、 ν1aN ：第１ａサブ群中の負レンズのアッベ数、 Ｎ1bN ：第１ｂサブ群中の負レンズのｄ線の屈折率、 ν1bN ：第１ｂサブ群中の負レンズのアッベ数、 である。SUMMARY OF THE INVENTION The zoom lens system according to the present invention comprises, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length. In a zoom lens that changes magnification by changing the interval,
The first lens group comprises, in order from the object side, a 1a sub group and a 1b sub group, and each of the 1a sub group and the 1b sub group has at least one negative lens. It is characterized in that the expressions (1) to (5) are satisfied. The diaphragm is located between the first lens group and the second lens group,
It moves integrally with the first lens group. (1) 3.5 <f L / f 1 <5.0 (2) 1.77 <N 1aN (3) 35 <ν 1aN <50 (4) 1.77 <N 1bN (5) 35 <ν 1bN <50 where f L is the focal length of the entire system on the long focal length side, f 1 is the focal length of the first lens group, N 1aN is the d-line refractive index of the negative lens in the 1a sub-group, and ν 1aN is the 1a is the Abbe number of the negative lens in the sub group, N 1bN is the d-line refractive index of the negative lens in the 1b sub group, and ν 1bN is the Abbe number of the negative lens in the 1b sub group.
【０００５】第２レンズ群は、物体側より順に、像面側
に凸面を有する正レンズと、物体側に凹面を有する負レ
ンズとの２枚とする構成、あるいは物体側より順に、像
面側に凸面を有する正レンズと、物体側に凹面を有する
負レンズと、像面側に凸面を有する正レンズの３枚とす
る構成のいずれかとすることが好ましい。前者の場合、
次の条件式（６）を満足することが好ましい。 （６）ν2-1 ＜３５ 但し、 ν2-1 ：第２レンズ群中の正レンズのｄ線のアッベ数、 である。また後者の場合には、条件式（６）と（７）の
双方を満足することが好ましい。 （６）ν2-1 ＜３５ （７）ν2-3 ＜３５ 但し、 ν2-1 ：第２レンズ群中の物体側正レンズのｄ線のアッ
ベ数、 ν2-3 ：第２レンズ群中の像面側正レンズのｄ線のアッ
ベ数、 である。The second lens group comprises two lenses, in order from the object side, a positive lens having a convex surface on the image side and a negative lens having a concave surface on the object side, or in order from the object side, the image surface side. It is preferable to adopt any one of the three lenses: a positive lens having a convex surface on the negative side, a negative lens having a concave surface on the object side, and a positive lens having a convex surface on the image side. In the former case,
It is preferable that the following conditional expression (6) is satisfied. (6) ν 2-1 <35 where ν 2-1 is the Abbe number of the positive lens in the second lens group at the d line. In the latter case, it is preferable that both conditional expressions (6) and (7) are satisfied. (6) ν 2-1 <35 (7) ν 2-3 <35 where ν 2-1 is the Abbe number of the d-line of the object-side positive lens in the second lens group, and ν 2-3 is the second lens Is the Abbe number of the d-line of the image-side positive lens in the group.
【０００６】本発明のズームレンズ系はさらに、変倍比
が２．８を越えるときには、次の条件式（１’）を満足
することが好ましい。 （１’）４．０＜ｆL ／ｆ1 ＜５．０The zoom lens system of the present invention preferably further satisfies the following conditional expression (1 ') when the zoom ratio exceeds 2.8. (1 ′) 4.0 <f L / f 1 <5.0
【０００７】[0007]
【発明の実施の態様】物体側から正、負の２群タイプの
ズームレンズを小型化するには、第１レンズ群、第２レ
ンズ群ともに、パワーを大きくする必要がある。条件式
（１）は第１レンズ群のパワーに関する条件である。ま
た、この条件式（１）は、第２レンズ群の横倍率も間接
的に規定している。つまり、第１レンズ群のパワーが大
きくなると、第２レンズ群のパワーも大きくなりやす
い。この条件式の下限を越えて変倍比を大きくしようと
すると、レンズ群の移動量が増大し、小型化の目的を達
成できない。逆に上限を越えると、小型化には有利であ
るが、収差を補正することが困難となる。ちなみに従来
の２群タイプのズームレンズは、この条件式（１）の下
限に至らない変倍比のものが殆どである。なお、変倍比
が２．８倍を越える場合には、４．０＜ｆL ／ｆ1 ＜
５．０を満足することが好ましい。変倍比が２．８倍を
越えるときには、条件式（１）の範囲をこのように狭め
ることにより、レンズ群の移動量の増大を防ぎ、小型化
を図ることができる。BEST MODE FOR CARRYING OUT THE INVENTION In order to reduce the size of a positive and negative two-group type zoom lens from the object side, it is necessary to increase the power of both the first lens group and the second lens group. Conditional expression (1) is a condition related to the power of the first lens group. This conditional expression (1) also indirectly defines the lateral magnification of the second lens group. That is, when the power of the first lens group increases, the power of the second lens group also tends to increase. If an attempt is made to increase the zoom ratio beyond the lower limit of this conditional expression, the amount of movement of the lens group will increase and the object of downsizing cannot be achieved. On the other hand, when the value exceeds the upper limit, it is advantageous for downsizing, but it becomes difficult to correct aberration. Incidentally, most of the conventional two-group type zoom lenses have a zoom ratio that does not reach the lower limit of the conditional expression (1). When the zoom ratio exceeds 2.8, 4.0 <f L / f 1 <
It is preferable to satisfy 5.0. When the variable power ratio exceeds 2.8 times, by narrowing the range of the conditional expression (1) in this way, it is possible to prevent an increase in the amount of movement of the lens group and achieve size reduction.
【０００８】条件式（２）及び（４）は第１レンズ群中
の２枚の負レンズを高屈折率材料から形成することを定
めている。本発明のズームレンズ系は、第１レンズ群に
条件式（１）に示すような大きな正のパワーを持たせた
ので、収差を補正するために、第１レンズ群を構成する
前サブ群１ａと後サブ群１ｂにそれぞれ少なくとも１枚
の負レンズを配置した。前サブ群１ａの負レンズは、特
に歪曲収差及び非点収差の補正に有効であり、後サブ群
１ｂの負レンズは、特に球面収差及びコマ収差の補正に
有効である。Conditional expressions (2) and (4) define that the two negative lenses in the first lens group are made of a high refractive index material. In the zoom lens system of the present invention, since the first lens group has a large positive power as expressed by the conditional expression (1), the front sub group 1a constituting the first lens group is configured to correct the aberration. At least one negative lens is arranged in each of the rear sub-group 1b. The negative lens of the front sub-group 1a is particularly effective in correcting distortion and astigmatism, and the negative lens of the rear sub-group 1b is particularly effective in correcting spherical aberration and coma.
【０００９】一方、これらの負レンズのパワーは、レン
ズ全長の小型化を図る程、大となり、その結果、ペッツ
バール和が負になりやすく、短焦点側のサジタルの非点
収差がプラス（オーバー）の大きな値になってしまう。
条件式（２）と（４）は、ペッツバール和が小さくなり
過ぎないように（負の値にならないように）するため
に、これらの負レンズが満足すべき屈折率の条件であ
る。なお条件式（２）及び（４）の下限値は、コスト的
に許せば、１．８１＜Ｎ1aN あるいは１．８１＜Ｎ1bN
とし、少なくとも一方の負レンズをさらに高屈折率ガラ
スから構成することが好ましい。On the other hand, the power of these negative lenses becomes larger as the total length of the lenses is made smaller, and as a result, the Petzval sum tends to be negative, and sagittal astigmatism on the short focal side is positive (over). Will be a large value.
The conditional expressions (2) and (4) are the conditions of the refractive index that these negative lenses should satisfy in order to prevent the Petzval sum from becoming too small (not to take a negative value). Note that the lower limits of conditional expressions (2) and (4) are 1.81 <N 1aN or 1.81 <N 1bN if cost permits.
It is preferable that at least one of the negative lenses is made of glass having a high refractive index.
【００１０】また、これらの２枚の高屈折率の負レンズ
は、両方とも条件式（３）及び（５）の下限以上のアッ
ベ数を有する材料を使用するのが良い。また、条件式
（３）及び（５）の上限を越えると、第１レンズ群中で
の色収差の補正が不足する。ちなみに従来の正、負の２
群ズームレンズでは、第１レンズ群中の負レンズの少な
くとも１つは条件式（３）あるいは（５）の下限以下の
分散の大きい（アッベ数の小さい）ＳＦ系の材料から構
成して色収差の補正を行っていた。本ズームレンズ系
は、変倍比を大きくし小型化するために条件式（１）に
示すような、大きなパワーを第１レンズ群に持たせてい
るため、第１レンズ群中の負レンズにこの条件式の下限
以下の分散の大きい材料を使うと、短焦点側で補正不
足、長焦点側で補正過剰の傾向が増大してしまう。条件
式（１）の条件下では、両方の負レンズをともに、条件
式（３）及び（５）の下限より大きく上限より小さい中
間的な分散値を有する材料から構成することにより、色
収差を良好に補正することができる。Further, for these two negative lenses having a high refractive index, it is preferable to use a material having an Abbe number equal to or more than the lower limits of the conditional expressions (3) and (5). If the upper limits of conditional expressions (3) and (5) are exceeded, correction of chromatic aberration in the first lens group will be insufficient. By the way, conventional positive and negative 2
In the group zoom lens, at least one of the negative lenses in the first lens group is made of an SF type material having a large dispersion (small Abbe number) equal to or lower than the lower limit of the conditional expression (3) or (5), and chromatic aberration I was making corrections. In this zoom lens system, since the first lens group has a large power as shown in the conditional expression (1) in order to increase the zoom ratio and reduce the size, the negative lens in the first lens group If a material having a large dispersion equal to or lower than the lower limit of this conditional expression is used, the tendency of insufficient correction on the short focus side and excessive correction on the long focus side increases. Under the condition of the conditional expression (1), both negative lenses are made of a material having an intermediate dispersion value larger than the lower limit and smaller than the upper limit of the conditional expressions (3) and (5), thereby improving the chromatic aberration. Can be corrected to.
【００１１】条件式（６）、（７）は、負の焦点距離を
有する第２レンズ群において色収差を補正するための材
料に関する条件である。前述のように、第２レンズ群
は、 物体側より順に、像面側に凸面を有する正レンズと、
物体側に凹面を有する負レンズとの２枚とする構成、及
び 物体側より順に、像面側に凸面を有する正レンズと、
物体側に凹面を有する負レンズと、像面側に凸面を有す
る正レンズの３枚とする構成、のいずれかとすることが
できる。の場合、負の第２レンズ群で色収差を補正す
るために、物体側の正レンズは条件式（６）を満足する
分散の大きい材料から構成するのがよい。条件式（６）
の上限を越えると第２レンズ群内の色収差の補正が不足
する。Conditional expressions (6) and (7) are conditions regarding materials for correcting chromatic aberration in the second lens group having a negative focal length. As described above, the second lens group includes, in order from the object side, a positive lens having a convex surface on the image plane side,
A negative lens having a concave surface on the object side, and a positive lens having a convex surface on the image surface side in order from the object side;
Either of a negative lens having a concave surface on the object side and a positive lens having a convex surface on the image side can be used. In this case, in order to correct chromatic aberration with the negative second lens group, the positive lens on the object side is preferably made of a material having a large dispersion that satisfies the conditional expression (6). Conditional expression (6)
If the upper limit of is exceeded, the correction of chromatic aberration in the second lens group will be insufficient.
【００１２】さらに、条件式（１）に示す大きいパワー
を第１レンズ群に持たせる本ズームレンズ系において
は、の構成とすることがより望ましい。第２レンズ群
中の物体側と像面側にそれぞれ正レンズを配置すること
により、個々の正レンズのパワーをそれ程大きくしない
で色収差を補正することができる。この物体側、像面側
の正レンズもそれぞれ、条件式（６）、（７）に示すよ
うな分散の大きい材料から構成するのがよい。条件式
（６）及び（７）の上限を越えると第２レンズ群内の色
収差の補正が不足する。Further, in the present zoom lens system in which the first lens group has a large optical power represented by the conditional expression (1), it is more preferable to have the constitution of By disposing the positive lenses on the object side and the image plane side in the second lens group, it is possible to correct the chromatic aberration without increasing the power of the individual positive lenses so much. It is preferable that the positive lens on the object side and the positive lens on the image surface side are also made of a material having a large dispersion as represented by conditional expressions (6) and (7). If the upper limits of conditional expressions (6) and (7) are exceeded, correction of chromatic aberration in the second lens group will be insufficient.
【００１３】第２レンズ群を、物体側より順に、像面側
に凸面を有する正レンズと、物体側に凹面を有する負レ
ンズとの２枚から構成し、あるいは、物体側より順に、
像面側に凸面を有する正レンズと、物体側に凹面を有す
る負レンズと、像面側に凸面を有する正レンズの３枚か
ら構成する理由は、絞（第１レンズ群側）にコンセント
リックなレンズ面の組み合わせとすることにより、非点
収差、歪曲収差の補正が容易になり、かつ各面の偏心等
の製作誤差の影響が小さくなるからである。The second lens group comprises two lenses, in order from the object side, a positive lens having a convex surface on the image side and a negative lens having a concave surface on the object side, or in order from the object side.
The reason why it is composed of three lenses, a positive lens having a convex surface on the image side, a negative lens having a concave surface on the object side, and a positive lens having a convex surface on the image side, is because the aperture (first lens group side) is concentric. This is because such a combination of lens surfaces facilitates correction of astigmatism and distortion, and reduces the influence of manufacturing errors such as decentering of each surface.
【００１４】本発明のズームレンズ系は、第１レンズ群
が条件式（２）ないし（５）が満足し、第２レンズ群が
同時に条件式（６）（及び（７））を満足するとき、最
も好ましい色収差の補正ができるが、第１レンズ群だけ
がその条件式を満足する場合でも、一定の色収差の補正
を行なうことができる。In the zoom lens system of the present invention, when the first lens group satisfies the conditional expressions (2) to (5) and the second lens group simultaneously satisfies the conditional expressions (6) (and (7)). Although the most preferable chromatic aberration can be corrected, even if only the first lens group satisfies the conditional expression, a certain chromatic aberration can be corrected.
【００１５】次に、具体的な数値実施例を５例示す。い
ずれの実施例も、絞Ｓは、第１レンズ群１１の後方にあ
って、第１レンズ群と一体に移動する。 ［実施例１］図１は、本発明のズームレンズ系の第１の
実施例を示すもので、正の第１レンズ群１１は、物体側
から第１ａサブ群１１ａと、第１ｂサブ群１１ｂとから
なり、負の第２レンズ群１２は、物体側から、物体側よ
り順に、像面側に凸面を有する正レンズ１２−１、物体
側に凹面を有する負レンズ１２−２と、像面側に凸面を
有する正レンズ１２−３の３枚からなっている。負レン
ズ１２−２と正レンズ１２−３は貼り合わされている。
また、実施例では、第１ａサブ群１１ａは負の焦点距離
を有し、第１ｂサブ群１１ｂは正の焦点距離を有してい
る。Next, five concrete numerical examples will be shown. In any of the examples, the diaphragm S is behind the first lens group 11 and moves integrally with the first lens group. [Embodiment 1] FIG. 1 shows a first embodiment of the zoom lens system according to the present invention. The positive first lens group 11 includes a first-a sub group 11a and a first-b sub group 11b from the object side. The negative second lens group 12 includes, from the object side, in order from the object side, a positive lens 12-1 having a convex surface on the image surface side, a negative lens 12-2 having a concave surface on the object side, and an image surface. It consists of three positive lenses 12-3 having a convex surface on the side. The negative lens 12-2 and the positive lens 12-3 are bonded together.
Further, in the embodiment, the 1a sub group 11a has a negative focal length, and the 1b sub group 11b has a positive focal length.
【００１６】このレンズ系の具体的数値データを表１に
示し、ワイド端、中間焦点距離及びテレ端での諸収差を
それぞれ図２、図３及び図４に示す。諸収差図中、ＳＡ
は球面収差、ＳＣは正弦条件、ｄ線、ｇ線、Ｃ線は、そ
れぞれの波長における、球面収差によって示される色収
差と倍率色収差、Ｓはサジタル、Ｍはメリディオナルを
示している。Specific numerical data of this lens system are shown in Table 1, and various aberrations at the wide end, the intermediate focal length and the tele end are shown in FIGS. 2, 3 and 4, respectively. SA in the aberration diagrams
Is a spherical aberration, SC is a sine condition, d-line, g-line, and C-line are chromatic aberration and chromatic aberration of magnification indicated by spherical aberration at respective wavelengths, S is sagittal, and M is meridional.
【００１７】表および図面中、FNO はＦナンバー、f は
焦点距離、ωは半画角、fBはバックフォーカス、Ｚは変
倍比（ズーム比）を表す。ｒは曲率半径、ｄはレンズ厚
または間隔、Ｎd はｄ線の屈折率、νd はｄ線のアッベ
数を示す。In the table and drawings, F NO is an F number, f is a focal length, ω is a half angle of view, f B is a back focus, and Z is a zoom ratio. r is the radius of curvature, d is the lens thickness or spacing, Nd is the d-line refractive index, and vd is the d-line Abbe number.
【００１８】[0018]
【表１】 FNO=1:3.9-7.0-10.2 f=39.10-70.00-102.00 (Z=2.61) ω＝２８．３−１７．０−１１．９ ｆＢ＝９．００−３４．６０−６１．１０ 絞Ｓの位置；第１レンズ群（第９面）の後方０．８０ 面 No. ｒ ｄ Ｎd νd 1 17.992 2.10 1.51633 64.1 2 30.803 1.88 - - 3 -13.957 1.74 1.80400 46.6 4 -33.036 1.75 - - 5 153.568 3.24 1.51742 52.4 6 -14.922 0.10 - - 7 55.595 3.55 1.51821 65.0 8 -10.787 1.60 1.83400 37.2 9 -22.425 11.49-5.32-2.87 - - 10 ＊ -40.015 2.67 1.58547 29.9 11 -22.871 4.29 - - 12 -10.015 1.50 1.77250 49.6 13 -125.591 2.00 1.80518 25.4 14 -52.499 - - - ＊は非球面 非球面データ No.10: K=0.0、A4=0.69412 ×10-4、A6=0.29909×10-6、A8=0.42828×10-8、 A10=0.0、A12=0.0 但し、非球面は次式で定義される。 x=Ch2/{1+[1-(1+K)C2h2]1/2}+A4h4+A6h6+A8h8+・・・ （Ｃは曲率(1/r)、ｈは光軸からの高さ、Ｋは円錐係数) [Table 1] F NO = 1: 3.9-7.0-10.2 f = 39.10-70.00-102.00 (Z = 2.61) ω = 28.3-17.0-11.9 f B = 9.00-34.60- 61.10 Position of diaphragm S; 0.80 surface behind the first lens group (9th surface) No. rd Nd νd 1 17.992 2.10 1.51633 64.1 2 30.803 1.88--3 -13.957 1.74 1.80400 46.6 4 -33.036 1.75- -5 153.568 3.24 1.51742 52.4 6 -14.922 0.10--7 55.595 3.55 1.51821 65.0 8 -10.787 1.60 1.83400 37.2 9 -22.425 11.49-5.32-2.87--10 * -40.015 2.67 1.58547 29.9 11 -22.871 4.29--12 -10.015 1.50 1.77250 49.6 13 -125.591 2.00 1.80518 25.4 14 -52.499---* is aspherical surface Aspherical data No.10: K = 0.0, A4 = 0.69412 × 10 -4 , A6 = 0.29909 × 10 -6 , A8 = 0.42828 × 10 -8 , A10 = 0.0, A12 = 0.0 However, the aspherical surface is defined by the following equation. x = Ch 2 / {1+ [1- (1 + K) C 2 h 2 ] 1/2 } + A4h 4 + A6h 6 + A8h 8 + ... (C is curvature (1 / r), h is (Height from the optical axis, K is the cone coefficient)
【００１９】［実施例２］図５は、本発明のズームレン
ズ系の第２の実施例を示す。第１レンズ群１１の基本的
なレンズ配置は図１と同様であるが、第２レンズ群１２
は、物体側より、像面側に凸面を有する正レンズ１２−
１と、物体側に凹面を有する負レンズ１２−２の２枚構
成である。このレンズ系の具体的数値データを表２に示
し、ワイド端、中間焦点距離及びテレ端での諸収差をそ
れぞれ図６、図７、及び図８に示す。[Embodiment 2] FIG. 5 shows a second embodiment of the zoom lens system according to the present invention. The basic lens arrangement of the first lens group 11 is the same as in FIG. 1, but the second lens group 12
Is a positive lens 12− having a convex surface on the image side from the object side.
1 and a negative lens 12-2 having a concave surface on the object side. Specific numerical data of this lens system are shown in Table 2, and various aberrations at the wide end, the intermediate focal length and the tele end are shown in FIGS. 6, 7 and 8, respectively.
【００２０】[0020]
【表２】 FNO=1:3.9-7.0-10.2 f=39.10-70.00-102.00 (Z=2.61) ω=28.4-17.0-11.9 fB=9.59-35.19-61.69 絞Ｓの位置；第１レンズ群（第９面）の後方1.10 面 No. ｒ ｄ Ｎd νd 1 22.512 2.10 1.48749 70.2 2 49.260 1.58 - - 3 -15.294 1.35 1.83481 42.7 4 -30.778 3.66 - - 5 149.034 2.87 1.51633 64.1 6 -16.836 0.10 - - 7 98.227 3.42 1.51742 52.4 8 -11.278 1.55 1.83400 37.2 9 -22.266 12.65-5.87-3.17 - - 10 ＊ -43.815 2.58 1.58547 29.9 11 ＊ -25.397 4.81 - - 12 -10.675 1.50 1.72916 54.7 13 -65.116 - - - ＊は非球面 非球面データ No.10: K=0.0、A4=0.37425 ×10-4、A6=0.58266×10-6、A8=-0.21222 ×10-8、 A10=0.0、A12=0.0 No.11: K=0.0、A4=-0.21131×10-4、A6=0.36410×10-6、A8=-0.46460 ×10-8、 A10=0.0、Ａ１２＝０．０ [Table 2] F NO = 1: 3.9-7.0-10.2 f = 39.10-70.00-102.00 (Z = 2.61) ω = 28.4-17.0-11.9 f B = 9.59-35.19-61.69 Aperture S position; first lens group Rear of (No. 9) 1.10 No. rd Nd νd 1 22.512 2.10 1.48749 70.2 2 49.260 1.58--3 -15.294 1.35 1.83481 42.7 4 -30.778 3.66--5 149.034 2.87 1.51633 64.1 6 -16.836 0.10--7 98.227 3.42 1.51742 52.4 8 -11.278 1.55 1.83400 37.2 9 -22.266 12.65-5.87-3.17--10 * -43.815 2.58 1.58547 29.9 11 * -25.397 4.81--12 -10.675 1.50 1.72916 54.7 13 -65.116---* is an aspherical surface Spherical data No.10: K = 0.0, A4 = 0.37425 × 10 -4 , A6 = 0.58266 × 10 -6 , A8 = -0.21222 × 10 -8 , A10 = 0.0, A12 = 0.0 No.11: K = 0.0, A4 = -0.21131 × 10 -4 , A6 = 0.36410 × 10 -6 , A8 = -0.46460 × 10 -8 , A10 = 0.0, A12 = 0.0
【００２１】［実施例３］図９は、本発明のズームレン
ズ系の第３の実施例であり、基本的なレンズ配置は図５
の実施例２と同じである。このレンズ系の数値データを
表３に示し、ワイド端、中間焦点距離及びテレ端の諸収
差をそれぞれ図１０、図１１、及び図１２に示す。[Embodiment 3] FIG. 9 shows a third embodiment of the zoom lens system according to the present invention. The basic lens arrangement is shown in FIG.
The same as Example 2 of. Numerical data of this lens system is shown in Table 3, and various aberrations at the wide end, the intermediate focal length and the tele end are shown in FIGS. 10, 11 and 12, respectively.
【００２２】[0022]
【表３】 ＦＮＯ＝１：３．９−７．０−１０．２ ｆ＝３９．１０−７０．００−１０２．００ （Ｚ＝２．６１） ω=28.4-17.0-12.0 fB=9.47-35.81-63.08 絞Ｓの位置；第１レンズ群（第９面）の後方0.80 面 No. ｒ ｄ Ｎd νd 1 20.550 2.10 1.48749 70.2 2 42.672 1.65 - - 3 -15.428 1.66 1.83400 37.2 4 -30.458 3.06 - - 5 631.122 2.80 1.51633 64.1 6 -16.980 0.10 - - 7 91.952 3.42 1.53996 59.5 8 -11.244 1.60 1.80400 46.6 9 -23.784 12.55-5.42-2.59 - - 10 ＊ -42.469 2.48 1.58547 29.9 11 -26.490 5.04 - - 12 -10.416 1.50 1.71299 53.9 13 -48.829 - - - ＊は非球面 非球面データ No.10: K=0.0、A4=0.59622 ×10-4、A6=0.25265×10-6、A8=0.28963×10-8、 A10=0.0、A12=0.0 Table 3 F NO = 1: 3.9-7.0-10.2 f = 39.10-70.00-102.00 (Z = 2.61) ω = 28.4-17.0-12.0 f B = 9.47-35.81-63.08 Position of diaphragm S; rear 0.80 surface of the first lens group (9th surface) No. rd Nd νd 1 20.550 2.10 1.48749 70.2 2 42.672 1.65--3 -15.428 1.66 1.83400 37.2 4 -30.458 3.06- -5 631.122 2.80 1.51633 64.1 6 -16.980 0.10--7 91.952 3.42 1.53996 59.5 8 -11.244 1.60 1.80400 46.6 9 -23.784 12.55-5.42-2.59--10 * -42.469 2.48 1.58547 29.9 11 -26.490 5.04--12 -10.416 1.50 1.71299 53.9 13 -48.829---* is aspherical surface Aspherical data No.10: K = 0.0, A4 = 0.59622 × 10 -4 , A6 = 0.25265 × 10 -6 , A8 = 0.28963 × 10 -8 , A10 = 0.0 , A12 = 0.0
【００２３】［実施例４］図１３は、本発明のズームレ
ンズ系の第４の実施例であり、基本的なレンズ配置は図
５の実施例２と同じである。このレンズ系の数値データ
を表４に示し、ワイド端、中間焦点距離及びテレ端での
諸収差をそれぞれ図１４、図１５、及び図１６に示す。[Fourth Embodiment] FIG. 13 is a fourth embodiment of the zoom lens system according to the present invention, and the basic lens arrangement is the same as that of the second embodiment in FIG. Numerical data of this lens system are shown in Table 4, and various aberrations at the wide end, the intermediate focal length and the tele end are shown in FIGS. 14, 15 and 16, respectively.
【００２４】[0024]
【表４】 FNO=1:3.6-6.2-10.3 f=29.05-50.00-83.00 (Z=2.86) ω=30.1-18.9-11.7 fB=7.05-24.80-52.74 絞Ｓの位置；第１レンズ群（第９面）の後方0.75 面 No. ｒ ｄ Ｎd νd 1 20.519 2.00 1.58144 40.7 2 63.956 1.26 - - 3 -13.675 3.50 1.83400 37.2 4 -77.662 0.50 - - 5 212.248 2.98 1.48749 70.2 6 -14.500 0.10 - - 7 31.509 3.46 1.51823 59.0 8 -8.315 1.40 1.83481 42.7 9 -14.134 9.50-4.76-2.15 - - 10 ＊ -31.994 2.15 1.58547 29.9 11 -20.351 3.75 - - 12 -7.667 1.50 1.69680 55.5 13 -40.281 - - - ＊は非球面 非球面データ No.10: K=0.0、A4=0.14588 ×10-3、A6=0.67501×10-6、A8=0.31082×10-7、 A10=0.0、A12=0.0 [Table 4] F NO = 1: 3.6-6.2-10.3 f = 29.05-50.00-83.00 (Z = 2.86) ω = 30.1-18.9-11.7 f B = 7.05-24.80-52.74 Position of diaphragm S; 1st lens group No. rd Nd νd 1 20.519 2.00 1.58144 40.7 2 63.956 1.26--3 -13.675 3.50 1.83400 37.2 4 -77.662 0.50--5 212.248 2.98 1.48749 70.2 6 -14.500 0.10--7 31.509 3.46 1.51823 59.0 8 -8.315 1.40 1.83481 42.7 9 -14.134 9.50-4.76-2.15--10 * -31.994 2.15 1.58547 29.9 11 -20.351 3.75--12 -7.667 1.50 1.69680 55.5 13 -40.281---* is aspheric Aspheric surface Data No. 10: K = 0.0, A4 = 0.14588 × 10 -3 , A6 = 0.67501 × 10 -6 , A8 = 0.31082 × 10 -7 , A10 = 0.0, A12 = 0.0
【００２５】［実施例５］図１７は、本発明のズームレ
ンズ系の第５の実施例であり、基本的なレンズ配置は図
５の実施例２と同じである。このレンズ系の数値データ
を表５に示し、ワイド端、中間焦点距離及びテレ端での
諸収差をそれぞれ図１８、図１９、及び図２０に示す。[Embodiment 5] FIG. 17 is a fifth embodiment of the zoom lens system according to the present invention, and the basic lens arrangement is the same as that of Embodiment 2 in FIG. Numerical data of this lens system is shown in Table 5, and various aberrations at the wide end, the intermediate focal length and the tele end are shown in FIGS. 18, 19 and 20, respectively.
【００２６】[0026]
【表５】 FNO=1:3.6-6.2-10.3 f=29.05-50.00-83.00 (Z=2.86) ω=30.1-18.9-11.7 fB=7.03-24.68-52.48 絞Ｓの位置；第１レンズ群（第９面）の後方0.75 面 No. ｒ ｄ Ｎd νd 1 18.990 2.00 1.51742 52.4 2 96.284 1.20 - - 3 -14.173 3.82 1.83481 42.7 4 -348.482 0.20 - - 5 227.735 3.24 1.48749 70.2 6 -14.069 0.10 - - 7 27.577 3.49 1.52249 59.8 8 -8.441 1.40 1.83481 42.7 9 -14.395 9.53-4.77-2.15 - - 10 ＊ -36.588 2.16 1.58547 29.9 11 -21.650 3.76 - - 12 -7.650 1.50 1.69680 55.5 13 -41.750 - - - ＊は非球面 非球面データ No.10: K=0.0、A4=0.14756 ×10-3、A6=0.68350×10-6、A8=0.30229×10-7、 A10=0.0、A12=0.0 [Table 5] F NO = 1: 3.6-6.2-10.3 f = 29.05-50.00-83.00 (Z = 2.86) ω = 30.1-18.9-11.7 f B = 7.03-24.68-52.48 Position of diaphragm S; 1st lens group No. rd Nd νd 1 18.990 2.00 1.51742 52.4 2 96.284 1.20--3 -14.173 3.82 1.83481 42.7 4 -348.482 0.20--5 227.735 3.24 1.48749 70.2 6 -14.069 0.10--7 27.577 3.49 1.52249 59.8 8 -8.441 1.40 1.83481 42.7 9 -14.395 9.53-4.77-2.15--10 * -36.588 2.16 1.58547 29.9 11 -21.650 3.76--12 -7.650 1.50 1.69680 55.5 13 -41.750---* is aspherical Aspherical surface Data No. 10: K = 0.0, A4 = 0.14756 × 10 -3 , A6 = 0.68350 × 10 -6 , A8 = 0.30229 × 10 -7 , A10 = 0.0, A12 = 0.0
【００２７】表６に、各条件式（１）ないし（７）の数
値を、各実施例について示す。Table 6 shows numerical values of the conditional expressions (1) to (7) for each example.
【表６】 実施例１ 実施例２ 実施例３ 条件式（１） ３．９７ ３．７９ ３．７５ 条件式（２） １．８０４ １．８３５ １．８３４ 条件式（３） ４６．６ ４２．７ ３７．２ 条件式（４） １．８３４ １．８３４ １．８０４ 条件式（５） ３７．２ ３７．２ ４６．６ 条件式（６） ２９．９ ２９．９ ２９．９ 条件式（７） ２５．４ − − 実施例４ 実施例５ 条件式（１） ４．２１ ４．１９ 条件式（２） １．８３４ １．８３５ 条件式（３） ３７．２ ４２．７ 条件式（４） １．８３５ １．８３５ 条件式（５） ４２．７ ４２．７ 条件式（６） ２９．９ ２９．９ 条件式（７） − − Table 6 Example 1 Example 2 Example 3 Conditional expression (1) 3.97 3.79 3.75 Conditional expression (2) 1.804 1.835 1.834 Conditional expression (3) 46.6 42 .7 37.2 Conditional Expression (4) 1.834 1.834 1.804 Conditional Expression (5) 37.2 37.2 46.6 Conditional Expression (6) 29.9 29.9 29.9 Conditional Expression ( 7) 25.4-Example 4 Example 5 Conditional expression (1) 4.21 4.19 Conditional expression (2) 1.834 1.835 Conditional expression (3) 37.2 42.7 Conditional expression (4) ) 1.835 1.835 Conditional expression (5) 42.7 42.7 Conditional expression (6) 29.9 29.9 Conditional expression (7) ---
【００２８】表６から明らかなように、実施例１ないし
実施例５の各数値は、条件式（１）ないし（６）（及び
（７））を満足している。また本発明のズームレンズ系
は、諸収差図に示すように、それぞれ諸収差がよく補正
されている。As is apparent from Table 6, the numerical values of Examples 1 to 5 satisfy the conditional expressions (1) to (6) (and (7)). Further, in the zoom lens system of the present invention, various aberrations are well corrected, as shown in various aberration diagrams.
【００２９】[0029]
【発明の効果】本発明のズームレンズ系によれば、２群
ズームでありながら、変倍比が２．５以上と大きく、か
つ性能の良好な小型のズームレンズが得られる。According to the zoom lens system of the present invention, it is possible to obtain a small-sized zoom lens having a large zoom ratio of 2.5 or more and good performance even though it is a two-group zoom.
【図１】本発明によるズームレンズ系の第１の実施例を
示すレンズ構成図である。FIG. 1 is a lens configuration diagram showing a first embodiment of a zoom lens system according to the present invention.
【図２】図１のズームレンズ系のワイド端における諸収
差図である。FIG. 2 is a diagram of various types of aberration at the wide end of the zoom lens system in FIG.
【図３】図１のズームレンズ系の中間焦点距離における
諸収差図である。FIG. 3 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図４】図１のズームレンズ系のテレ端における諸収差
図である。FIG. 4 is a diagram of various types of aberration at the tele end of the zoom lens system in FIG.
【図５】本発明によるズームレンズ系の第２の実施例を
示すレンズ構成図である。FIG. 5 is a lens configuration diagram showing a second embodiment of the zoom lens system according to the present invention.
【図６】図５のズームレンズ系のワイド端における諸収
差図である。FIG. 6 is a diagram of various types of aberration at the wide end of the zoom lens system in FIG.
【図７】図５のズームレンズ系の中間焦点距離における
諸収差図である。7 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図８】図５のズームレンズ系のテレ端における諸収差
図である。8 is a diagram of various types of aberration at the tele end of the zoom lens system in FIG.
【図９】本発明によるズームレンズ系の第３の実施例を
示すレンズ構成図である。FIG. 9 is a lens configuration diagram showing a third embodiment of the zoom lens system according to the present invention.
【図１０】図９のズームレンズ系のワイド端における諸
収差図である。FIG. 10 is a diagram of various types of aberration at the wide end of the zoom lens system in FIG.
【図１１】図９のズームレンズ系の中間焦点距離におけ
る諸収差図である。11 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図１２】図９のズームレンズ系のテレ端における諸収
差図である。12 is a diagram of various types of aberration at the tele end of the zoom lens system in FIG.
【図１３】本発明によるズームレンズ系の第４の実施例
を示すレンズ構成図である。FIG. 13 is a lens configuration diagram showing a fourth embodiment of the zoom lens system according to the present invention.
【図１４】図１３のズームレンズ系のワイド端における
諸収差図である。14 is a diagram of various types of aberration at the wide end of the zoom lens system in FIG.
【図１５】図１３のズームレンズ系の中間焦点距離にお
ける諸収差図である。15 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図１６】図１３のズームレンズ系のテレ端における諸
収差図である。16 is a diagram of various types of aberration at the tele end of the zoom lens system in FIG.
【図１７】本発明によるズームレンズ系の第５の実施例
を示すレンズ構成図である。FIG. 17 is a lens configuration diagram showing a fifth embodiment of the zoom lens system according to the present invention.
【図１８】図１７のズームレンズ系のワイド端における
諸収差図である。18 is a diagram of various types of aberration at the wide end of the zoom lens system in FIG.
【図１９】図１７のズームレンズ系の中間焦点距離にお
ける諸収差図である。19 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図２０】図１７のズームレンズ系のテレ端における諸
収差図である。20 is a diagram of various types of aberration at the telephoto end of the zoom lens system in FIG.
１１ 第１レンズ群 １１ａ 第１ａサブ群 １１ｂ 第１ｂサブ群 １２ 第２レンズ群 11 1st lens group 11a 1a subgroup 11b 1b 1st subgroup 12 2nd lens group
Claims (3)
第１レンズ群と、負の焦点距離を有する第２レンズ群か
らなり、第１、第２レンズ群間隔を変化させて変倍を行
うズームレンズにおいて、 前記第１レンズ群は、物体側から順に、第１ａサブ群
と、第１ｂサブ群からなり、 この第１ａサブ群、第１ｂサブ群はともに少なくとも１
枚の負レンズを有し、 下記の条件式（１）ないし（５）を満足するズームレン
ズ系。 （１）３．５＜ｆL ／ｆ1 ＜５．０ （２）１．７７＜Ｎ1aN （３）３５＜ν1aN ＜５０ （４）１．７７＜Ｎ1bN （５）３５＜ν1bN ＜５０ 但し、 ｆL ：長焦点側の全系の焦点距離、 ｆ1 ：第１レンズ群の焦点距離、 Ｎ1aN ：第１ａサブ群中の負レンズのｄ線の屈折率、 ν1aN ：第１ａサブ群中の負レンズのアッベ数、 Ｎ1bN ：第１ｂサブ群中の負レンズのｄ線の屈折率、 ν1bN ：第１ｂサブ群中の負レンズのアッベ数。1. A zoom lens system comprising, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length, and varying the distance between the first and second lens groups to perform zooming. In the zoom lens to be performed, the first lens group includes, in order from the object side, a 1a sub-group and a 1b sub-group, and both of the 1a sub-group and the 1b sub-group are at least 1
A zoom lens system having a negative lens and satisfying the following conditional expressions (1) to (5). (1) 3.5 <f L / f 1 <5.0 (2) 1.77 <N 1aN (3) 35 <ν 1aN <50 (4) 1.77 <N 1bN (5) 35 <ν 1bN <50 where f L is the focal length of the entire system on the long focal length side, f 1 is the focal length of the first lens group, N 1aN is the d-line refractive index of the negative lens in the 1a sub-group, and ν 1aN is the 1a Abbe number of the negative lens in the sub group, N 1bN : d-line refractive index of the negative lens in the 1b sub group, ν 1bN : Abbe number of the negative lens in the 1b sub group.
は、物体側より順に、像面側に凸面を有する正レンズ
と、物体側に凹面を有する負レンズとの２枚からなり、
下記条件式（６）を満足するズームレンズ系。 （６）ν2-1 ＜３５ 但し、 ν2-1 ：第２レンズ群中の正レンズのｄ線のアッベ数、2. The second lens group according to claim 1, comprising, in order from the object side, a positive lens having a convex surface on the image side and a negative lens having a concave surface on the object side,
A zoom lens system that satisfies the following conditional expression (6). (6) ν 2-1 <35 where ν 2-1 : Abbe number of d line of the positive lens in the second lens group,
は、物体側より順に、像面側に凸面を有する正レンズ
と、物体側に凹面を有する負レンズと、像面側に凸面を
有する正レンズの３枚からなり、 下記条件式（６）及び（７）を満足するズームレンズ
系。 （６）ν2-1 ＜３５ （７）ν2-3 ＜３５ 但し、 ν2-1 ：第２レンズ群中の物体側正レンズのｄ線のアッ
ベ数、 ν2-3 ：第２レンズ群中の像面側正レンズのｄ線のアッ
ベ数。3. The positive lens according to claim 1, wherein the second lens group has, in order from the object side, a positive lens having a convex surface on the image surface side, a negative lens having a concave surface on the object side, and a convex surface on the image surface side. A zoom lens system including three positive lenses and satisfying the following conditional expressions (6) and (7). (6) ν 2-1 <35 (7) ν 2-3 <35 where ν 2-1 is the Abbe number of the d-line of the object-side positive lens in the second lens group, ν 2-3 is the second lens Abbe number of d-line of the image side positive lens in the group.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7200703A JPH08227038A (en) | 1994-12-22 | 1995-08-07 | Zoom lens system |
| US08/575,772 US5751498A (en) | 1994-12-22 | 1995-12-20 | Zoom lens system |
| GB9526227A GB2296340B (en) | 1994-12-22 | 1995-12-21 | Two group zoom lens system |
| DE19548478A DE19548478A1 (en) | 1994-12-22 | 1995-12-22 | Zoom lens |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6-320988 | 1994-12-22 | ||
| JP32098894 | 1994-12-22 | ||
| JP7200703A JPH08227038A (en) | 1994-12-22 | 1995-08-07 | Zoom lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08227038A true JPH08227038A (en) | 1996-09-03 |
Family
ID=26512352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7200703A Pending JPH08227038A (en) | 1994-12-22 | 1995-08-07 | Zoom lens system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5751498A (en) |
| JP (1) | JPH08227038A (en) |
| DE (1) | DE19548478A1 (en) |
| GB (1) | GB2296340B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000193885A (en) * | 1998-12-24 | 2000-07-14 | Asahi Optical Co Ltd | Zoom lens system |
| US11262540B2 (en) | 2018-10-24 | 2022-03-01 | Largan Precision Co., Ltd. | Imaging lens system, image capturing unit and electronic device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100189064B1 (en) * | 1996-08-30 | 1999-06-01 | 이해규 | Small size wide angle zoom lens |
| JPH1138320A (en) * | 1997-07-22 | 1999-02-12 | Asahi Optical Co Ltd | Zoom lens system |
| JPH11125769A (en) | 1997-10-21 | 1999-05-11 | Asahi Optical Co Ltd | Zoom lens system |
| JPH11337822A (en) | 1998-05-26 | 1999-12-10 | Asahi Optical Co Ltd | Zoom lens system |
| JP3311294B2 (en) * | 1998-07-14 | 2002-08-05 | 旭光学工業株式会社 | Zoom lens system |
| JP3495622B2 (en) | 1998-12-22 | 2004-02-09 | ペンタックス株式会社 | Zoom lens system |
| JP2003114385A (en) * | 2001-10-05 | 2003-04-18 | Pentax Corp | Zoom lens system |
| US6922290B2 (en) * | 2002-06-14 | 2005-07-26 | Pentax Corporation | Zoom lens system |
| WO2005074361A2 (en) * | 2004-02-05 | 2005-08-18 | Earlysense Ltd. | Techniques for prediction and monitoring of respiration-manifested clinical episodes |
| US10721986B2 (en) * | 2017-08-02 | 2020-07-28 | Leonardo German Prezioso | Adjustable headwear visor |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8628333D0 (en) * | 1985-11-28 | 1986-12-31 | Asahi Optical Co Ltd | Zoom lens system |
| JPH07111502B2 (en) * | 1986-12-19 | 1995-11-29 | 旭光学工業株式会社 | Zoom lens for compact camera |
| JPS63161422A (en) * | 1986-12-25 | 1988-07-05 | Konica Corp | Small-sized zoom lens |
| JPS6457222A (en) * | 1987-08-28 | 1989-03-03 | Asahi Optical Co Ltd | Zoom lens for compact camera |
| JPH01193808A (en) * | 1988-01-29 | 1989-08-03 | Asahi Optical Co Ltd | Zoom lens for compact camera |
| JP2817916B2 (en) * | 1988-03-25 | 1998-10-30 | 旭光学工業株式会社 | Zoom lens for high zoom ratio compact camera |
| JPH0250118A (en) * | 1988-05-02 | 1990-02-20 | Ricoh Co Ltd | Zoom lens |
| JP2918115B2 (en) * | 1988-09-30 | 1999-07-12 | キヤノン株式会社 | Variable power optical system with vibration proof function |
| JP2915934B2 (en) * | 1989-09-29 | 1999-07-05 | 旭光学工業株式会社 | Zoom lens for compact camera |
| JPH03240013A (en) * | 1990-02-19 | 1991-10-25 | Nikon Corp | Compact wide-angle zoom lens |
| US5144489A (en) * | 1990-05-18 | 1992-09-01 | Nikon Corporation | Compact wide-angle zoom lens |
| JP2910206B2 (en) * | 1990-10-05 | 1999-06-23 | 株式会社ニコン | Compact zoom lens |
| JP3191296B2 (en) * | 1990-10-16 | 2001-07-23 | 株式会社ニコン | Panoramic camera |
| JP3248906B2 (en) * | 1990-11-30 | 2002-01-21 | 旭光学工業株式会社 | Zoom lens |
| JP3294870B2 (en) * | 1991-07-04 | 2002-06-24 | 旭光学工業株式会社 | Zoom lens |
| JP3181638B2 (en) * | 1991-07-04 | 2001-07-03 | 旭光学工業株式会社 | Zoom lens |
| US5353163A (en) * | 1991-07-17 | 1994-10-04 | Nikon Corporation | Wide-angle zoom lens |
| JP3162114B2 (en) * | 1991-07-24 | 2001-04-25 | オリンパス光学工業株式会社 | Two-group zoom lens |
| US5528428A (en) * | 1991-11-13 | 1996-06-18 | Nikon Corporation | Compact wide-angle objective lens |
| US5270861A (en) * | 1991-12-13 | 1993-12-14 | Eastman Kodak Company | Zoom lens system for use in a compact camera |
| US5270867A (en) * | 1991-12-13 | 1993-12-14 | Eastman Kodak Company | Compact zoom lens having a weak front lens group |
| JP3093850B2 (en) * | 1992-01-06 | 2000-10-03 | オリンパス光学工業株式会社 | Wide-angle zoom lens |
| KR100310435B1 (en) * | 1993-12-22 | 2001-12-28 | 이중구 | Wide-angle zoom lens |
-
1995
- 1995-08-07 JP JP7200703A patent/JPH08227038A/en active Pending
- 1995-12-20 US US08/575,772 patent/US5751498A/en not_active Expired - Fee Related
- 1995-12-21 GB GB9526227A patent/GB2296340B/en not_active Expired - Fee Related
- 1995-12-22 DE DE19548478A patent/DE19548478A1/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000193885A (en) * | 1998-12-24 | 2000-07-14 | Asahi Optical Co Ltd | Zoom lens system |
| US11262540B2 (en) | 2018-10-24 | 2022-03-01 | Largan Precision Co., Ltd. | Imaging lens system, image capturing unit and electronic device |
| US11933947B2 (en) | 2018-10-24 | 2024-03-19 | Largan Precision Co., Ltd. | Imaging lens system, image capturing unit and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| US5751498A (en) | 1998-05-12 |
| GB2296340A (en) | 1996-06-26 |
| DE19548478A1 (en) | 1996-06-27 |
| GB9526227D0 (en) | 1996-02-21 |
| GB2296340B (en) | 1998-08-26 |
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